Marketing is different from networking. Networking seeks to find individual opportunities through connecting individual people. Marketing aims to build a general awareness of your brand and services
This involves pushing your services and work in front of those that are not actively seeking your specific capabilities but could use them periodically or frequently.
Signage - in front of your studio
Handing out business cards - to everyone (they're cheap)
Postcard campaigns - to clients you would like to have (see Networking)
Cold-calling - clients you would like to have (see Networking)
Participating in a Freelance Job Board like Fiver or Upwork.
Sponsoring events - related to your field. This can mean creating the media for it and getting a sponsor credit for doing that work.
Website search engine optimization (really only effective if you are in the retail arena)
This involves pulling in prospects that are actively seeking your services and work.
Blogging on a platform like Substack or writing articles for a self-publishing platform like Medium
Participate in online communities - sharing knowledge and resources
Participate in social media - have friends in your industry
Provide training to others - this often turns into contract work for you
Giveaways - do a project for a potential client for free or give them something cool (but cheap)
Create something entertaining that could go micro-viral. Like a series of tutorials, speed paints, or curation of something (Pinterest).
Whenever you complete an especially good project, land a fancy new client or just do anything noteworthy, put out a press release. These can be very short one or two sentence statements that you post on your blog, on-line community or social media site.
More substantial and formal releases can be made and submitted to news organization, publishers and websites. Keep them to one page and include (in this order): Who, What, When, Where, How, Why
Same as above only as posts on Social Media of any project, personal or client or job driven.